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Standalone View

				mongo backend
				=============

				Provenance storage implementation using MongoDB

				initial data-model
				------------------

				```json
				content
				{
				id: sha1
				ts: int //optional
				revision: {<ref revision str>: [<ref path>]}
				directory: {<ref directory str>: [<ref path>]}
				}

				directory
				{
				id: sha1
				ts: int //optional
				revision: {<ref revision str>: [<ref path>]}
				}

				revision
				{
				id: sha1
				ts: int // optional
				preferred <ref origin> //optinal
				origin [<ref origin>]
				revision [<ref revisions>]
				}

				origin
				{
				id: sha1
				url: str
				}

				path
				{
				path: str
				}
				```